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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net earnings $ 264,508 $ 124,766 $ 497,277 $ 301,045
Basic earnings (loss) per common share:        
Net earnings (in dollars per basic share) $ 1.84 $ 0.87 $ 3.46 $ 2.09
Weighted average shares outstanding - basic (in shares) 143,941,000 143,955,000 143,854,000 144,107,000
Diluted earnings (loss) per common share:        
Net earnings (in dollars per diluted share) $ 1.82 $ 0.86 $ 3.43 $ 2.07
Weighted average shares outstanding - diluted (in shares) 145,118,000 144,995,000 145,040,000 145,359,000
Reconciliation Of Share Amounts Used In Computing Earnings Per Share [Abstract]        
Weighted average shares outstanding - basic (in shares) 143,941,000 143,955,000 143,854,000 144,107,000
Dilutive effect of assumed exercise of SAR's and vesting of performance shares (in shares) 1,177,000 1,040,000 1,186,000 1,252,000
Weighted average shares outstanding - diluted (in shares) 145,118,000 144,995,000 145,040,000 145,359,000
Antidilutive securities excluded from computation of earnings per share   121,000 34,000 130,000